/*
 * crc8.c
 *
 * Change Logs:
 * Date           Author            Notes
 * 2020-07-02     qiyongzhong       first version
 */

#include "crc8.h"

#ifdef CRCLIB_USING_CRC8

#if (defined(CRC8_USING_CONST_TABLE) && (CRC8_POLY == 0x8C))
static const u8 crc8_table[] = {
	0x00, 0x5E, 0xBC, 0xE2, 0x61, 0x3F, 0xDD, 0x83, 
	0xC2, 0x9C, 0x7E, 0x20, 0xA3, 0xFD, 0x1F, 0x41, 
	0x9D, 0xC3, 0x21, 0x7F, 0xFC, 0xA2, 0x40, 0x1E, 
	0x5F, 0x01, 0xE3, 0xBD, 0x3E, 0x60, 0x82, 0xDC, 
	0x23, 0x7D, 0x9F, 0xC1, 0x42, 0x1C, 0xFE, 0xA0, 
	0xE1, 0xBF, 0x5D, 0x03, 0x80, 0xDE, 0x3C, 0x62, 
	0xBE, 0xE0, 0x02, 0x5C, 0xDF, 0x81, 0x63, 0x3D, 
	0x7C, 0x22, 0xC0, 0x9E, 0x1D, 0x43, 0xA1, 0xFF, 
	0x46, 0x18, 0xFA, 0xA4, 0x27, 0x79, 0x9B, 0xC5, 
	0x84, 0xDA, 0x38, 0x66, 0xE5, 0xBB, 0x59, 0x07, 
	0xDB, 0x85, 0x67, 0x39, 0xBA, 0xE4, 0x06, 0x58, 
	0x19, 0x47, 0xA5, 0xFB, 0x78, 0x26, 0xC4, 0x9A, 
	0x65, 0x3B, 0xD9, 0x87, 0x04, 0x5A, 0xB8, 0xE6, 
	0xA7, 0xF9, 0x1B, 0x45, 0xC6, 0x98, 0x7A, 0x24, 
	0xF8, 0xA6, 0x44, 0x1A, 0x99, 0xC7, 0x25, 0x7B, 
	0x3A, 0x64, 0x86, 0xD8, 0x5B, 0x05, 0xE7, 0xB9, 
	0x8C, 0xD2, 0x30, 0x6E, 0xED, 0xB3, 0x51, 0x0F, 
	0x4E, 0x10, 0xF2, 0xAC, 0x2F, 0x71, 0x93, 0xCD, 
	0x11, 0x4F, 0xAD, 0xF3, 0x70, 0x2E, 0xCC, 0x92, 
	0xD3, 0x8D, 0x6F, 0x31, 0xB2, 0xEC, 0x0E, 0x50, 
	0xAF, 0xF1, 0x13, 0x4D, 0xCE, 0x90, 0x72, 0x2C, 
	0x6D, 0x33, 0xD1, 0x8F, 0x0C, 0x52, 0xB0, 0xEE, 
	0x32, 0x6C, 0x8E, 0xD0, 0x53, 0x0D, 0xEF, 0xB1, 
	0xF0, 0xAE, 0x4C, 0x12, 0x91, 0xCF, 0x2D, 0x73, 
	0xCA, 0x94, 0x76, 0x28, 0xAB, 0xF5, 0x17, 0x49, 
	0x08, 0x56, 0xB4, 0xEA, 0x69, 0x37, 0xD5, 0x8B, 
	0x57, 0x09, 0xEB, 0xB5, 0x36, 0x68, 0x8A, 0xD4, 
	0x95, 0xCB, 0x29, 0x77, 0xF4, 0xAA, 0x48, 0x16, 
	0xE9, 0xB7, 0x55, 0x0B, 0x88, 0xD6, 0x34, 0x6A, 
	0x2B, 0x75, 0x97, 0xC9, 0x4A, 0x14, 0xF6, 0xA8, 
	0x74, 0x2A, 0xC8, 0x96, 0x15, 0x4B, 0xA9, 0xF7, 
	0xB6, 0xE8, 0x0A, 0x54, 0xD7, 0x89, 0x6B, 0x35
};
#elif (defined(CRC8_USING_CONST_TABLE) && (CRC8_POLY == 0xD9))
static const u8 crc8_table[] = {
	0x00, 0xD0, 0x13, 0xC3, 0x26, 0xF6, 0x35, 0xE5, 
	0x4C, 0x9C, 0x5F, 0x8F, 0x6A, 0xBA, 0x79, 0xA9, 
	0x98, 0x48, 0x8B, 0x5B, 0xBE, 0x6E, 0xAD, 0x7D, 
	0xD4, 0x04, 0xC7, 0x17, 0xF2, 0x22, 0xE1, 0x31, 
	0x83, 0x53, 0x90, 0x40, 0xA5, 0x75, 0xB6, 0x66, 
	0xCF, 0x1F, 0xDC, 0x0C, 0xE9, 0x39, 0xFA, 0x2A, 
	0x1B, 0xCB, 0x08, 0xD8, 0x3D, 0xED, 0x2E, 0xFE, 
	0x57, 0x87, 0x44, 0x94, 0x71, 0xA1, 0x62, 0xB2, 
	0xB5, 0x65, 0xA6, 0x76, 0x93, 0x43, 0x80, 0x50, 
	0xF9, 0x29, 0xEA, 0x3A, 0xDF, 0x0F, 0xCC, 0x1C, 
	0x2D, 0xFD, 0x3E, 0xEE, 0x0B, 0xDB, 0x18, 0xC8, 
	0x61, 0xB1, 0x72, 0xA2, 0x47, 0x97, 0x54, 0x84, 
	0x36, 0xE6, 0x25, 0xF5, 0x10, 0xC0, 0x03, 0xD3, 
	0x7A, 0xAA, 0x69, 0xB9, 0x5C, 0x8C, 0x4F, 0x9F, 
	0xAE, 0x7E, 0xBD, 0x6D, 0x88, 0x58, 0x9B, 0x4B, 
	0xE2, 0x32, 0xF1, 0x21, 0xC4, 0x14, 0xD7, 0x07, 
	0xD9, 0x09, 0xCA, 0x1A, 0xFF, 0x2F, 0xEC, 0x3C, 
	0x95, 0x45, 0x86, 0x56, 0xB3, 0x63, 0xA0, 0x70, 
	0x41, 0x91, 0x52, 0x82, 0x67, 0xB7, 0x74, 0xA4, 
	0x0D, 0xDD, 0x1E, 0xCE, 0x2B, 0xFB, 0x38, 0xE8, 
	0x5A, 0x8A, 0x49, 0x99, 0x7C, 0xAC, 0x6F, 0xBF, 
	0x16, 0xC6, 0x05, 0xD5, 0x30, 0xE0, 0x23, 0xF3, 
	0xC2, 0x12, 0xD1, 0x01, 0xE4, 0x34, 0xF7, 0x27, 
	0x8E, 0x5E, 0x9D, 0x4D, 0xA8, 0x78, 0xBB, 0x6B, 
	0x6C, 0xBC, 0x7F, 0xAF, 0x4A, 0x9A, 0x59, 0x89, 
	0x20, 0xF0, 0x33, 0xE3, 0x06, 0xD6, 0x15, 0xC5, 
	0xF4, 0x24, 0xE7, 0x37, 0xD2, 0x02, 0xC1, 0x11, 
	0xB8, 0x68, 0xAB, 0x7B, 0x9E, 0x4E, 0x8D, 0x5D, 
	0xEF, 0x3F, 0xFC, 0x2C, 0xC9, 0x19, 0xDA, 0x0A, 
	0xA3, 0x73, 0xB0, 0x60, 0x85, 0x55, 0x96, 0x46, 
	0x77, 0xA7, 0x64, 0xB4, 0x51, 0x81, 0x42, 0x92, 
	0x3B, 0xEB, 0x28, 0xF8, 0x1D, 0xCD, 0x0E, 0xDE
};
#else
static u8 crc8_table[256];
void crc8_table_init(void)
{
	u32 i, j;
	u8 c;
	u8 poly = CRC8_POLY;
	
	for (i = 0; i < 256; i++)
	{
	    c = i;
		
		for (j = 0; j < 8; j++)
		{
			if(c & 0x01)
				c = poly ^ (c >> 1);
			else
				c >>= 1;
		}
		
		crc8_table[i] = c;
    }
}
INIT_BOARD_EXPORT(crc8_table_init);
#endif

u8 crc8_cyc_cal(u8 init_val, u8 *pdata, u32 len)
{
	register u32 i;
	register u8 crc8;
	register u8 idx;
	
	crc8 = init_val;
	for(i=0; i<len; i++)
	{
		idx = (crc8) ^ (*pdata++);
		crc8 = crc8_table[idx];
	}
	
	return(crc8);
}

u8 crc8_cal(u8 *pdata, u32 len)
{
	return(crc8_cyc_cal(CRC8_INIT_VAL, pdata, len) ^ CRC8_INIT_VAL);	
}

#endif

